Key parameters at a glance
- A radius of 2.21 Earth radii
- A mass of 5.52 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 8.439 days
- Semi-major axis 0.0881 AU
- Equilibrium temperature 653 K (380 °C)
- Distance from Earth 402.60 light-years
- Earth Similarity Index 0.406
- Travel time at Voyager 1 speed 7,099,858 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-275
K2-275 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| K2-275 b | Sub-Neptune | 2.34 | 6.08 | 3.281 | 1,166 | 2018 |
| K2-275 c this | Sub-Neptune | 2.21 | 5.52 | 8.439 | 653 | 2018 |
K2-275 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1658of 1978
top 83.8%
This planet
2.21R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-275 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.21 | 11.21 |
| Mass (M⊕) | 1.00 | 5.52 | 317.83 |
| Density (g/cm³) | 5.51 | 2.81 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 45.76 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 332022997
Gaia DR2
Gaia DR2 661598415839633024
Gaia DR3
Gaia DR3 661598415839633024
System
K2-275
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.44 Earth days (2.3% of a terrestrial year) at a mean orbital distance of 0.0881 AU.
Transit Fingerprint
Depth
0.110 %
Duration
2.340 h
Impact parameter b
0.330
Rp / R★
0.029300
Transit midpoint (BJD)
2,457,142.4867
Photometric dip
Transit produces a flux drop of 1,095 ppm lasting ≈ 2.34 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029300
Semi-major axis / stellar radius
27.500
Impact parameter (b)
0.330
Transit mid-time (BJD)
2,457,142.4867
Angular separation (arcsec)
0.71400
Eq. Temperature
653K
(380 °C)
Insolation (S⊕)
45.76
Earth = 1.00
Earth Similarity (ESI)
0.406
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Livingston et al. 2018Instrument
Kepler CCD Array
Publication
2018-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-275
Spectral Class
K-type orange
Effective Temperature
4,841 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.690 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.650 dex
Stellar density
2.737 g/cm³
Systemic radial velocity
-7.35 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
8.073 mas
Total Proper Motion
16.382 mas/yr
PM Right Ascension
-4.87 mas/yr
PM Declination
-15.64 mas/yr
Galactic Cartesian (pc)
x = -0.629 · y = 0.694 · z = 0.349
Equatorial (J2000)
RA 132.16988° · Dec 20.45502°
Galactic ℓ, b
205.824° · 34.581°
Ecliptic λ, β
129.018° · 2.545°
HTM-20 index
1703794800
Similar Worlds
Kepler-55 c
Sub-Neptune · K-type orange
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Kepler-1026 b
Sub-Neptune · K-type orange
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Kepler-989 b
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Kepler-1874 b
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Kepler-169 e
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Kepler-229 b
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,694.9 ly